如何从文件中删除一个属性（如只读）？ [英] How to remove a single Attribute (e.g. ReadOnly) from a File?

问题描述

让说，文件具有以下属性：只读，隐藏，存档，系统。 如何删除只有一个属性？（例如只读） 如果我使用：

Let say, a file has the following attributes: ReadOnly, Hidden, Archived, System. How can I remove only one Attribute? (for example ReadOnly) If I use:

Io.File.SetAttributes("File.txt",IO.FileAttributes.Normal)

它会删除所有属性。

it removes all the attributes.

推荐答案

从 MSDN ：您可以删除任何属性，这样

From MSDN: You can remove any attribute like this

（但只是只读@ SLL的回答是只是属性更好）

(but @sll's answer for just ReadOnly is better for just that attribute)

using System;
using System.IO;
using System.Text;
class Test 
{
    public static void Main() 
    {
        string path = @"c:\temp\MyTest.txt";

        // Create the file if it exists.
        if (!File.Exists(path)) 
        {
            File.Create(path);
        }

        FileAttributes attributes = File.GetAttributes(path);

        if ((attributes & FileAttributes.ReadOnly) == FileAttributes.ReadOnly)
        {
            // Make the file RW
            attributes = RemoveAttribute(attributes, FileAttributes.ReadOnly);
            File.SetAttributes(path, attributes);
            Console.WriteLine("The {0} file is no longer RO.", path);
        } 
        else 
        {
            // Make the file RO
            File.SetAttributes(path, File.GetAttributes(path) | FileAttributes.Hidden);
            Console.WriteLine("The {0} file is now RO.", path);
        }
    }

    private static FileAttributes RemoveAttribute(FileAttributes attributes, FileAttributes attributesToRemove)
    {
        return attributes & ~attributesToRemove;
    }
}

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